v For ®le CAUCNTL only, if recovery is not required ensure that RECOVERY(NONE) and FWDRECOVLOG(NO) are speci®ed.
3. INSTALL group mygroup to make these de®nitions known to CICS.
Tailoring your CICS startup job
To enable the Transaction Affinities Utility to be run against your CICS region, take account of the following when setting up your CICS startup job:
v The Transaction Affinities Utility sends messages to the transient data destination CAFF. For you to see all the messages sent to CAFF, the queue must be prede®ned to the transient data component. The CAFF queue is de®ned in the CICS-supplied group, DFHDCTG. DFHDCTG contains de®nitions for all the CICS-supplied transient data queues and is installed on cold starts as part of DFHLIST processing. Unlike most CICS-supplied groups, DFHDCTG is unique in that it is not locked. Therefore, you can alter the de®nition for CAFF using either the DFHCSDUP utility or the CEDA transaction.
You do not have to specify the extrapartition transient data data set in your start-up JCL, because of the introduction of dynamic allocation for such data sets. If you want to use dynamic allocation, specify a DSName in the de®nition of the queue. Alternatively, you can add a DD statement for the queue in your JCL. For example:
//CAFF DD SYSOUT=*
The default de®nition in group DFHDCTG routes the messages sent to CAFF to the SYSOUT class '*'.
For more information about dynamic allocation and de®ning transient data queues, see the CICS Resource De®nition Guide.
v Set the ICVR system initialization parameter to at least 10 seconds; that is, ICVR=10000 (or a larger value). If you do not do this, the Detector or one of your own transactions may end prematurely with an abend code of AICA.
v Set the DSHIPINT system initialization parameter to 0. If you specify a DSHIPINT value other than 0, the utility may not correctly observe terminal log offs or determine affinity life times.
If the CICS region is a target region, specify 0 on the AILDELAY system initialization parameter for all routing regions that route to it. This enables the Detector to immediately see when a terminal logs off.
(If you specify an AILDELAY value other than 0, the Detector may miss log offs and misinterpret affinity life times.)
Restarting your CICS region
Restart the CICS region using a CICS startup job modi®ed for affinity utility program support, as described in ªTailoring your CICS startup jobº.

Chapter 3. Preparing to use the affinity utility program 23

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IBM OS manual Preparing to use the affinity utility program
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OS specifications

IBM OS, or IBM Operating System, refers to a family of operating systems developed by IBM to support its hardware architectures. IBM has produced a range of OS versions tailored for different computing needs, such as mainframes, servers, and personal computers. Among the most notable operating systems in IBM's portfolio are OS/2, z/OS, and AIX, representing a blend of innovation and reliability that has defined IBM's reputation in the computing world.

One of the defining features of IBM OS is its robust multitasking capabilities. Both z/OS, predominantly used in IBM's mainframe environments, and AIX, the Unix-based system for IBM Power Systems, support multiple users and processes simultaneously. This ability allows organizations to run numerous applications in parallel efficiently, maximizing resource utilization and improving productivity.

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IBM's commitment to scalability is evident across its OS offerings. Organizations leveraging z/OS can handle enormous workloads and transactional volumes, making it a preferred choice for industries like finance and telecommunications. AIX also supports scalability, allowing businesses to expand their computing resources as demands grow without significant downtime.

The availability of development tools and environments is another noteworthy aspect of IBM OS. With robust IDEs and programming languages support, developers can create and deploy applications smoothly. This assists businesses in streamlining their development processes and improving time-to-market for innovative solutions.

In summary, IBM OS encompasses a suite of operating systems characterized by multitasking, security, adaptability to modern technologies, scalability, and comprehensive development support. These features have cemented IBM's position as a leader in enterprise solutions, allowing organizations across various industries to thrive in an increasingly digital world.
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